Made in the USA with a wear-resistant, self-lubricating lining, this surge actuator will work smoothly for years to come. Slide-Lok coupler ensures you'll always have a strong, secure connection. Primed for welding on a 50-degree A-frame trailer.
Features:
Specs:
If your trailer isn't married to just one tow vehicle, this Demco actuator will be a great option for you. Just keep in mind that because it doesn't have a reverse lockout on it to keep your brakes from activating when you drive in reverse, you will need to have free-backing brakes on your trailer.
Yeah, I think that's on there isn't something you want to say to yourself when you're hauling upwards of 3-1/2 tons because if you're unsure, you'll be constantly checking your side mirrors to make sure the trailer is still tracking behind you. Get a Bulldog-style Slide-Lok coupler and you won't have to second guess yourself again.
To hook up, simply remove the pin and slide the collar back to open up the jaws. Watch your fingers, because this thing is spring-loaded and it will bite you if you're not careful. Then, secure the jaws around your hitch ball and slide the collar up to hold them tightly in place. Replace the pin, give it a tug, and say, yep, that's not goin' anywhere .
You might see the phrase "hard plastic" and think, how durable could that really be? But the truth is, it's tougher than it looks and you'll probably never break it.
Its real name is acetal copolymer. It has a self-lubricating surface. It's extremely resilient, durable, and smooth. And it wears well over time. In fact, this same material can even be found in some automotive applications, making it perfectly suited for a telescoping trailer brake actuator on a utility, livestock, cargo, or construction trailer.
When you slow to a stop as you're towing, momentum pushes your trailer toward the rear of your vehicle. When this happens, the surge brake actuator compresses the master cylinder inside, which forces it to push hydraulic fluid out to your brake lines, ultimately engaging your trailer brakes. When you start moving again, the actuator will telescope back out, stopping the flow of fluid back to the brakes and allowing your trailer's wheels to start rolling again.
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Videos are provided as a guide only. Refer to manufacturer installation instructions and specs for complete information.
Hi everybody. Andy here with etrailer.com. Let's take a brief look together at this Demco hydraulic drum brake actuator for A-frame trailers with a two-inch Bulldog coupler. Now this is also identified by the model number DA91, and this has a gross towing weight of 7,000 pounds and a maximum tongue weight of 700 pounds. And this is going to weld onto your 50 degree A-frame trailer with hydraulic drum brakes. And this hydraulic actuator will activate your trailer brakes when your tow vehicle slows or stops.
As you know, when you apply the brakes in your tow vehicle, deceleration occurs, and momentum pushes your trailer toward the rear of your vehicle. With surge brake systems, the hydraulic actuator is actually triggered as your trailer moves forward once your tow vehicle starts to slow down. When this happens, the actuator contracts, applying force to its master cylinder. This in turn is gonna supply the necessary hydraulic pressure to engage the brakes on your trailer. Now this does feature a Bulldog Collar-Lok coupler that's going to fit tightly around your two-inch hitch ball for a secure connection.
This has a pin-style fastener that's going to hold the collar in place around the base of the hinge ball socket. And lemme just give you a brief demonstration of how this is going to work. So I have a two-inch ball there, and so I'm going to, actually, I'm gonna move this around on the other side, so hopefully you can see that just a little bit better. I'm going to slide this collar back and that's going to pop our coupler open, as you can see there. And so I'm just going to put the ball in there and then slide this collar back.
Obviously this is gonna be easier to do when you have this mounted on your trailer. So slide the collar back, push that in, and then that collar will go right over there and then you're secure in place, just like that. And you'll replace your pin there and then that collar will be secure in there. And then to remove it, you'll just slide that collar back, and then that will allow you to disconnect from that ball. So slide this back into place, collar's back in place, and I'm just gonna slide that pin back in.
If you notice the pin is tethered by a chain, which is great, because that's going to help you not easily misplace that pin. Now the composite master cylinder is durable and efficient. Its glass-reinforced nylon construction's gonna resist rust and corrosion, and the large reservoir provides increased capacity for brake fluid. The automotive style diaphragm cap is going to create a completely enclosed system to help prevent the contamination of the fluid. And then it's probably gonna be a little bit difficult for you to see, but maybe you can see it right, I'm sorry, right through here. This has an acetyl copolymer lining, it's going to provide smooth operation, as this actuator telescopes in and out. It's gonna hold up really well for you. And then the breakaway is included with the snap hook, as you can see right here. And it's on this cable here that's going to activate your brakes in an event of a breakaway situation. So you'll just clip this on your tow vehicle, right around the same place where you're going to connect your safety chains. So this is a excellent feature to have, as most states do require having a breakaway lever and cable. Now this is made here in the USA of a heavy-duty seal construction with this primed finish. It's kind of like a beige color, if I was gonna put a name to that color. And I do wanna point out that because this actuator does not include a reverse lockout, it is recommended that you equip your trailer with free backing brakes so that you can drive in reverse without this actuator triggering your trailer's brakes. Well, I think that's going to wrap up our brief look today. I do hope that our time together was helpful for you. Again, my name is Andy. Thank you for joining me.
Average Customer Rating: 4.9 out of 5 stars (29 Customer Reviews)
Made in the USA with a wear-resistant, self-lubricating lining, this surge actuator will work smoothly for years to come. Slide-Lok coupler ensures you'll always have a strong, secure connection. Primed for welding on a 50-degree A-frame trailer.
Great hitch
Good product excellent business
You did a great job and we received it very quickly. Thank you.
Very happy with my purchase. It was a good price, easy to order and was received in short time. Thank you!
far superior to what it is replacing. well constructed, fast shipping.
Thanks again for supplies a quality product keep it up!
Perfect , the delivery was faster than expected. The product is real good quality.
Thanks for your great service.
Regards,
Marcel
Excellent product. Exact product as shown. Quality materials. Quick to ship and receive.
Super replacement and much cheaper than the bulldog style.
this hitch was by far beyound my expections they will get most of my business
Have not installed yet, but the product appears to be of high quality and heavy weight steel. Looks great.. would reccomend to anyone!
Great design. Easy to install. Very sturdy and excellent updated features
The people at E-trailer were very helpful and the product that came was exactly what i needed.
Very good product. I have been a fabricator for 42 years, and I will say this is very well made. etrailer.com is a great place!
Product has met my expectations. The customer service at etrailer is fantastic.
Very impressed! This will be perfect for my trailer rebuild.
The product was just what I expected. The real story was that etrailer had a delay in shipping due to a manufacturer issue. Etrailer stayed in constant contact with me and made sure I was up to date on every stage of the order. AAA+ service...!!!
Yes i recieved the device , I'ts better than i expexted , very well built , Can definetely handle more weight than designed for, P/S I invented the device about 45 years ago. The device takes the shifting weight away from the hitch and tong of the trailer. The first device used a coil spring, The device i recieved uses a shock works the same as a coil spring.
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